A new dilute Mg–Mn–Al alloy with exceptional rollability and ductility at room temperature

Abstract

Poor plasticity at room temperature has been an acute challenge for the wrought magnesium alloys. Herein, we developed a dilute Mg-0.5Mn-0.1Al alloy with exceptional rollability (80% single-pass rolling reduction) and high ductility (56.3% tensile elongation) at room temperature. A fine grain structure with grains around 1 μm was obtained and a work softening behavior was observed. This exceptional rollability results from the dislocation annihilation at grain boundary and the occurrence of dynamic recrystallization (DRX) during deformation process at room temperature. The occurrence of DRX behavior at room temperature can be deviated into three stages: (1) activation of grain rotation, (2) initiation of grain boundary slip and non-basal plane slip, (3) the formation and of low angle grain boundaries and the immigration of grain boundaries.